S
M
T
W
T
F
S
26
64°
52°
27
64°
52°
28
68°
48°
29
70°
50°
30
66°
52°
1
64°
55°
2
64°
55°
3
66°
54°
4
66°
50°
5
63°
54°
6
73°
52°
7
74°
51°
8
75°
52°
9
78°
53°
10
83°
56°
11
86°
58°
12
83°
59°
13
77°
57°
14
79°
56°
15
76°
56°
16
74°
54°
17
73°
55°
18
74°
54°
19
73°
52°
20
69°
50°
21
68°
52°
22
69°
51°
23
70°
51°
24
71°
52°
25
70°
52°
26
70°
50°
27
73°
50°
28
70°
51°
29
76°
54°
30
78°
57°
31
78°
57°
1
77°
56°
2
76°
57°
3
73°
56°
4
72°
57°
5
71°
56°
6
72°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Cupertino
Cupertino's May 2026 forecast shows daily high temperatures ranging from 68° to 86°, with overnight lows between 50° and 59°. The average high for May is 74° with an average low of 54°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Cupertino. See also: June | July | August.
